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Look in the dropdown activated by the triangle in a circle on the top left, about half way down is are a pair of diamond shaped icons [show nudge tool xxxx], tap both of them [turn orange], do the same with the 'show pen settings, at the top of the dropdown. You can move then control the 'dot frame' by tapping on the arrows.
I 'remove' [hide] items on the pdf by activating the 'pencil'. selecting the rectangle mode, then selecting the appropriate background and fill colors to match my pdf background [black/white].